typedef enum { CTL_XIVELY_VALUE_TYPE_INT, CTL_XIVELY_VALUE_TYPE_FLOAT } CTL_XIVELY_VALUE_TYPE_t;
CTL_XIVELY_VALUE_TYPE_t defines the type of data held in the datapoint. The encoders use this to present data to the Xively service in the correct format.
ctl_xively_datapoint_write_int, ctl_xively_datapoint_write_float